e_qat.h

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/*****************************************************************************
 * @file e_qat.h
 *
 * This file provides and interface for an OpenSSL QAT engine implemenation
 *
 *****************************************************************************/

#ifndef E_QAT_H
# define E_QAT_H

# include <openssl/engine.h>
# include <sys/types.h>
# include <unistd.h>
# include <string.h>

# include "cpa.h"
# include "cpa_types.h"

# include "qat_aux.h"

# define QAT_RETRY_BACKOFF_MODULO_DIVISOR 8
# define QAT_INFINITE_MAX_NUM_RETRIES -1
# define QAT_INVALID_INSTANCE -1

# ifndef ERR_R_RETRY
#  define ERR_R_RETRY 57
# endif

typedef struct {
    int qatInstanceNumForThread;
    unsigned int localOpsInFlight;
} thread_local_variables_t;

typedef struct {
    CpaInstanceInfo2  qat_instance_info;
    unsigned int qat_instance_started;
} qat_instance_details_t;

typedef struct {
    unsigned int qat_accel_present;
    unsigned int qat_accel_reset_status;
} qat_accel_details_t;

#define likely(x)   __builtin_expect (!!(x), 1)
#define unlikely(x) __builtin_expect (!!(x), 0)

#define XSTR(x) #x
#define STR(x) XSTR(x)

#define QAT_ATOMIC_INC(qat_int)              \
            (__sync_add_and_fetch(&(qat_int), 1))

#define QAT_ATOMIC_DEC(qat_int)              \
            (__sync_sub_and_fetch(&(qat_int), 1))

#define QAT_INC_IN_FLIGHT_REQS(qat_int, tlv) \
            do {                             \
                if (qat_use_signals()) {     \
                    QAT_ATOMIC_INC(qat_int); \
                    tlv->localOpsInFlight++; \
                }                            \
            } while(0)

#define QAT_DEC_IN_FLIGHT_REQS(qat_int, tlv) \
            do {                             \
                if (qat_use_signals()) {     \
                    tlv->localOpsInFlight--; \
                    QAT_ATOMIC_DEC(qat_int); \
                }                            \
            } while(0)

/* Macro used to handle errors in qat_engine_ctrl() */
#define BREAK_IF(cond, mesg) \
    if (unlikely(cond)) { retVal = 0; WARN(mesg); break; }

#define QAT_QMEMFREE_BUFF(b) \
            do { \
                if (b != NULL) { \
                    qaeCryptoMemFree(b); \
                    b = NULL; \
                } \
            } while(0)

#define QAT_CLEANSE_FREE_BUFF(b,len) \
            do { \
                if (b != NULL) { \
                    OPENSSL_cleanse(b, len); \
                    OPENSSL_free(b); \
                    b = NULL; \
                } \
            } while(0)

#define QAT_CLEANSE_QMEMFREE_BUFF(b,len) \
            do { \
                if (b != NULL) { \
                    OPENSSL_cleanse(b, len); \
                    qaeCryptoMemFree(b); \
                    b = NULL; \
                } \
            } while(0)

#define QAT_CLEANSE_FLATBUFF(b) \
            OPENSSL_cleanse((b).pData, (b).dataLenInBytes)

#define QAT_QMEM_FREE_FLATBUFF(b) \
            qaeCryptoMemFree((b).pData)

#define QAT_CLEANSE_QMEMFREE_FLATBUFF(b) \
            do { \
                QAT_CLEANSE_FLATBUFF(b); \
                QAT_QMEM_FREE_FLATBUFF(b); \
            } while(0)

#define QAT_CHK_CLNSE_QMFREE_FLATBUFF(b) \
            do { \
                if ((b).pData != NULL) \
                    QAT_CLEANSE_QMEMFREE_FLATBUFF(b); \
            } while(0)

#define QAT_CHK_QMFREE_FLATBUFF(b) \
            do { \
                if ((b).pData != NULL) \
                    QAT_QMEM_FREE_FLATBUFF(b); \
            } while(0)

#define QAT_MAX_CRYPTO_INSTANCES 256
#define QAT_MAX_CRYPTO_ACCELERATORS 16

/* Behavior of qat_engine_finish_int */
#define QAT_RETAIN_GLOBALS 0
#define QAT_RESET_GLOBALS 1

/*
 * The default interval in nanoseconds used for the internal polling thread
 */
#define QAT_POLL_PERIOD_IN_NS 10000

/*
 * The number of retries of the nanosleep if it gets interrupted during
 * waiting between polling.
 */
#define QAT_CRYPTO_NUM_POLLING_RETRIES 5

/*
 * The number of retries of the sigtimedwait if it gets interrupted during
 * waiting for a signal.
 */
#define QAT_CRYPTO_NUM_EVENT_RETRIES 2

/*
 * The number of seconds to wait for a response back after submitting a
 * request before raising an error.
 */
#define QAT_CRYPTO_RESPONSE_TIMEOUT 5

/*
 * The default timeout in milliseconds used for epoll_wait when event driven
 * polling mode is enabled.
 */
#define QAT_EPOLL_TIMEOUT_IN_MS 1000

/*
 * The default timeout in seconds used when waiting for events that requests
 * are inflight.
 */
#define QAT_EVENT_TIMEOUT_IN_SEC 1

/*
 * Max Length (bytes) of error string in human readable format
 */
#define QAT_MAX_ERROR_STRING 256

/*
 * Different values passed in as param 3 for the message
 * QAT_CMD_GET_NUM_REQUESTS_IN_FLIGHT to retrieve the number of different kinds
 * of in-flight requests
 */
#define GET_NUM_ASYM_REQUESTS_IN_FLIGHT 1
#define GET_NUM_PRF_REQUESTS_IN_FLIGHT 2
#define GET_NUM_CIPHER_PIPELINE_REQUESTS_IN_FLIGHT 3

/* Qat engine id declaration */
extern const char *engine_qat_id;
extern const char *engine_qat_name;

extern char *ICPConfigSectionName_libcrypto;

extern CpaInstanceHandle *qat_instance_handles;
extern Cpa16U qat_num_instances;
extern Cpa32U qat_num_devices;
extern pthread_key_t thread_local_variables;
extern pthread_t polling_thread;
extern int keep_polling;
extern int enable_external_polling;
extern int enable_inline_polling;
extern int enable_event_driven_polling;
extern int enable_heuristic_polling;
extern int enable_instance_for_thread;
extern int qatPerformOpRetries;
extern pthread_mutex_t qat_instance_mutex;
extern pthread_mutex_t qat_engine_mutex;

extern unsigned int engine_inited;
extern qat_instance_details_t qat_instance_details[QAT_MAX_CRYPTO_INSTANCES];
extern qat_accel_details_t qat_accel_details[QAT_MAX_CRYPTO_ACCELERATORS];
extern useconds_t qat_poll_interval;
extern int qat_epoll_timeout;
extern int qat_max_retry_count;
extern int num_requests_in_flight;
extern int num_asym_requests_in_flight;
extern int num_prf_requests_in_flight;
extern int num_cipher_pipeline_requests_in_flight;
extern sigset_t set;
extern pthread_t timer_poll_func_thread;
extern int cleared_to_start;

/******************************************************************************
 * function:
 *         qat_get_qat_offload_disabled(void)
 *
 * description:
 *   This function indicates whether offloading to the QuickAssist hardware
 *   has been disabled. If it has then we can still perform crypto oncore.
 *
 ******************************************************************************/
int qat_get_qat_offload_disabled(void);

/******************************************************************************
 * function:
 *         qat_use_signals(void)
 *
 * description:
 *   This function indicates whether pthread signals are being used for thread
 *   synchronisation.  If so, then a non-zero value is returned, else zero is
 *   returned.
 *
 ******************************************************************************/
int qat_use_signals(void);


/******************************************************************************
 * function:
 *         qat_get_sw_fallback_enabled(void)
 *
 * description:
 *   Return the flag which indicates if QAT engine is enabled to fall back to
 *   software calculation.
 *
 ******************************************************************************/
int qat_get_sw_fallback_enabled(void);


/******************************************************************************
 * function:
 *         is_instance_available(int inst_num)
 *
 * description:
 *   Return whether the instance number passed in is a currently available
 *   instance. Returns 1 if available, 0 otherwise.
 *
 ******************************************************************************/
int is_instance_available(int inst_num);


/******************************************************************************
 * function:
 *         is_any_device_available(void)
 *
 * description:
 *   Return whether any devices are currently available.
 *   Returns 1 if at least one device is detected and up, 0 otherwise.
 *
 ******************************************************************************/
int is_any_device_available(void);


/******************************************************************************
 * function:
 *         get_next_inst_num(void)
 *
 * description:
 *   Return the next instance number to use for an operation.
 *
 ******************************************************************************/
int get_next_inst_num(void);


/******************************************************************************
 * function:
 *         qat_check_create_local_variables(void)
 *
 * description:
 *   This function checks whether local variables exist in the current thread.
 *   If not, then it will attempt to create them. It returns NULL if the local
 *   variables could not be created, otherwise it returns a pointer to the
 *   local variables data structure.
 *
 ******************************************************************************/
thread_local_variables_t * qat_check_create_local_variables(void);

/******************************************************************************
 * function:
 *         qat_engine_init(ENGINE *e)
 *
 * @param e [IN] - OpenSSL engine pointer
 *
 * description:
 *   Qat engine init function, associated with Crypto memory setup
 *   and cpaStartInstance setups.
 ******************************************************************************/
int qat_engine_init(ENGINE *e);


/******************************************************************************
 * function:
 *         qat_engine_finish_int(ENGINE *e, int reset_globals)
 *
 * @param e [IN] - OpenSSL engine pointer
 * @param reset_globals [IN] - Whether reset the global configuration variables
 *
 * description:
 *   Internal Qat engine finish function.
 *   The value of reset_globals should be either QAT_RESET_GLOBALS or
 *   QAT_RETAIN_GLOBALS
 ******************************************************************************/
int qat_engine_finish_int(ENGINE *e, int reset_globals);

#endif   /* E_QAT_H */